Tieinrich zublin and adolf zingg



UNiTED STATES BA'rnNr @Fnrcn. I

HEINRICH ZUBLIN AND ADOLF ZINGG, OF FRATTE DI SALERNO, ITALY, ASSIGNORS 1T0 SCHLAEPFER, WENNER & 00., OF SAME PLACE.

PROCESS OF DISCHARGE PRINTING.

SPECIFICATION forming part of Letters Patent No. 601,420, dated March. 29, 1898.

. Application filed June 22,1897. Serial No. 641,833. (No specimens.)

To all whom it may concern:

Be it known that we, HEINRICH Zi'IBLIN and ADOLF ZINGG, citizens of Switzerland, residing at Fratte di Salerno, Italy, have invented certain new and useful Improvements in lVhite and. Color Discharge or Enlevage Printing, of which the following is a specification.

The known process (invented by the Farbwerke, vormals Meister, Lucius & Briining, of Hochst-on-the-Main) for white and colored discharge or enlevage printing on dyed paranitranilin red by means of tin salt with an addition of glycerin, acetin, and similar substances has the disadvantage that a pure white cannot be produced without corroding the fiber, and, further, that such colored prints have only a very moderate degree of fastness. By our process these two drawbacks are entirely removed.

Our invention is based on the observation that finished dyed paranitranilin and other azo coloring-matters, which are produced directly upon the fiber, are reduced by glucose or other kinds of sugar in an alkaline solution in the presence of alcohol, phenol, naphthol, glycerin, or analogous substances.

Now our process differs from the well-known alkaline discharge or enlevage printing proc ess upon Turkey red (according to which the alumina-alizarin lake is split up into its constituents by the strong lye, and the glucose enters in the process only when indigo color is printed on at the same time) essentially in the fact that according to the new process the coloring-matter undergoes an alkaline reduction on the fiber.

The mode of operation which we employ is as follows: The bleached and dried material or fabric (which is impregnated with betanaphthol sodium, for instance, for dyeing red) is passed through diazo-paranitranilin, washed, and, if necessary, soaped, dried, impregnated on one or on both sides with glucose or other kinds of sugar, again dried, and then printed with a stronglyalkaline discharging or enlevage color, which contains in addition to glucose and glycerin or similar bodies of the hydroxyl group, (110,) as naphthol, phenol, alcohol, &c., a thickening agent, such as gum, British gum, tragacanth, 850.

After the printing and drying operations the fabric is steamed for a short time, passed through acids, Well washed, and soaped.

When printing with colors containing a great deal of sugar, such as can be used in perrotine printing -that is to say, in other words, when printing styles which allow using an abundance of color-the previous sugaring of the fabric may be omitted.

Besides white, which is'obtained by printing the above-named discharging composition, blue, yellow, green, or black can be simultaneously printed by mixing with the discharging composition indigo and caustic alkali for blue, lead oXid and soda for yellow, a mixture of the last two for green, and steam anilin black for black. The printed goods are dried,

steamed, passed through acid, soap,chromate,

and finished. The obtained colors are quite fast and the fibers will keep their original strength.

We give below some proportions of the agents used for enlevage printing of dyed paranitranilin red and related substances.

Strength of glucose solution used for impregnating the paranitranilin-dyed cloth, 16 Baum=25 Twaddle.

Discharging composition, (white 2) One kilogram British gum, two liters glycerin 42 Twaddle, one and two-tenths liters solution of gum-arabic, five liters solution of caustic soda 106 Twaddle, and two liters glucose 52 Twaddle.

Blue: Eight kilograms discharging compotion, (without g1uco se,) three kilograms indigo paste, (two and one-half kilograms indigo powder and three and one-half liters caustic soda 66% Twaddle.)

Yellow: Four kilograms discharging composition, (with glucose,) four kilograms lead paste-i. 8., a mixture of two kilograms oxid of lead, one liter glycerin, and three liters caustic soda 106 Twaddle.

Green: A mixture of above blue and yellow, proportions at pleasure.

Black: Steam anilin black with chromate.

Having fully described our invention, what we desire to claim and to secure by Letters Patent is- An improvement in the art of producing White and color discharge of finished dyed names to this specification in the presence of paranitranilin red and similar azo coloringtwo subscribing Witnesses.

matters, consisting in reducing the said 001- oring-matters by means of an alkaline solu- E%% tion and of glucose in the presence of a body of the hydroxyl group, as, for example, glyc- Witnesses:

ei in, substantially as described. CARL SCHLAEPFER,

In testimony whereof we have signed our FRITZ WENNER. 

